CAS OpenIR  > 湿法冶金清洁生产技术国家工程实验室
Removal of sodium (Na2O) from alumina extracted coal fly ash by a mild hydrothermal process
Li, Huiquan1; Hui, Junbo1,2; Wang, Chenye1; Bao, Weijun1; Sun, Zhenhua1
2015-03-01
Source PublicationHYDROMETALLURGY
ISSN0304-386X
Volume153Pages:1-5
AbstractSodium was removed from alumina-extracted coal fly ash (CFA) by using diluted NaOH solution. The effects of reaction temperature, reaction time, and NaOH concentration on sodium removal were studied. Result shows that the sodium (Na2O) content of the alumina-extracted CFA was decreased from 20 wt.% to 0.6 wt.% under optimal conditions: temperature of 185 degrees C, NaOH concentration of 50 g/L, residence time of 2 h, and liquid-to-solid ratio of 40 for water washing. The possible mechanism of sodium removal was also investigated using Fourier transform infrared spectroscopy, X-ray diffraction analysis, and nuclear magnetic resonance spectroscopy. The results indicated that NaCaHSiO4 in the residue was decomposed by NaOH to form NaSiO3 and Ca(OH)(2), and then converted into tobermorite [Ca5Si6O16(OH)(2)center dot nH(2)O] and NaOH. The sodium obtained through the reaction in the residue was mainly combined with the silanol group and then washed with water. (C) 2015 Elsevier B.V. All rights reserved.
KeywordCoal Fly Ash Nacahsio4 Sodium Removal Hydrothermal Process
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.hydromet.2015.02.001
Indexed BySCI
Language英语
WOS KeywordC-S-H ; ALKALI
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000353003600001
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/16736
Collection湿法冶金清洁生产技术国家工程实验室
Affiliation1.Chinese Acad Sci, Key Lab Green Proc & Engn, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Li, Huiquan,Hui, Junbo,Wang, Chenye,et al. Removal of sodium (Na2O) from alumina extracted coal fly ash by a mild hydrothermal process[J]. HYDROMETALLURGY,2015,153:1-5.
APA Li, Huiquan,Hui, Junbo,Wang, Chenye,Bao, Weijun,&Sun, Zhenhua.(2015).Removal of sodium (Na2O) from alumina extracted coal fly ash by a mild hydrothermal process.HYDROMETALLURGY,153,1-5.
MLA Li, Huiquan,et al."Removal of sodium (Na2O) from alumina extracted coal fly ash by a mild hydrothermal process".HYDROMETALLURGY 153(2015):1-5.
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